Only count the interrupt if the interrupt handler claims that it did

anything with it.

diff --git a/sys/arch/i386/isa/vector.s b/sys/arch/i386/isa/vector.s
index 82202e3..ab5273e 100644 (file)
--- a/sys/arch/i386/isa/vector.s
+++ b/sys/arch/i386/isa/vector.s
@@ -235,18 +235,20 @@ _Xresume/**/irq_num/**/:                                          ;\
        call    IH_FUN(%ebx)            /* call it */                   ;\
        addl    $4,%esp                 /* toss the arg */              ;\
        STRAY_INTEGRATE                 /* maybe he claimed it */       ;\
+       orl     %eax,%eax               /* should it be counted? */     ;\
+       jz      5f                      /* no, skip it */               ;\
        incl    IH_COUNT(%ebx)          /* count the intrs */           ;\
-       movl    IH_NEXT(%ebx),%ebx      /* next handler in chain */     ;\
+5:     movl    IH_NEXT(%ebx),%ebx      /* next handler in chain */     ;\
        testl   %ebx,%ebx                                               ;\
        jnz     7b                                                      ;\
        STRAY_TEST                      /* see if it's a stray */       ;\
-5:     UNMASK(irq_num, icu)            /* unmask it in hardware */     ;\
+6:     UNMASK(irq_num, icu)            /* unmask it in hardware */     ;\
        jmp     _Xdoreti                /* lower spl and do ASTs */     ;\
 IDTVEC(stray/**/irq_num)                                               ;\
        pushl   $irq_num                                                ;\
        call    _isa_strayintr                                          ;\
        addl    $4,%esp                                                 ;\
-       jmp     5b                                                      ;\
+       jmp     6b                                                      ;\
 IDTVEC(hold/**/irq_num)                                                        ;\
        orb     $IRQ_BIT(irq_num),_ipending + IRQ_BYTE(irq_num)         ;\
        INTRFASTEXIT